mbed library sources
Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more
Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
Diff: common/SPI.cpp
- Revision:
- 525:c320967f86b9
- Parent:
- 212:34d62c0b2af6
- Child:
- 552:a1b9575155a3
--- a/common/SPI.cpp Mon Apr 27 09:45:08 2015 +0100 +++ b/common/SPI.cpp Tue Apr 28 11:45:12 2015 +0100 @@ -19,8 +19,16 @@ namespace mbed { +#if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI +CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer; +#endif + SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) : _spi(), +#if DEVICE_SPI_ASYNCH + _irq(this), + _usage(DMA_USAGE_NEVER), +#endif _bits(8), _mode(0), _hz(1000000) { @@ -58,6 +66,115 @@ return spi_master_write(&_spi, value); } +#if DEVICE_SPI_ASYNCH + +int SPI::transfer(void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event) +{ + if (spi_active(&_spi)) { + return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event); + } + start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event); + return 0; +} + +void SPI::abort_transfer() +{ + spi_abort_asynch(&_spi); +#if TRANSACTION_QUEUE_SIZE_SPI + dequeue_transaction(); +#endif +} + + +void SPI::clear_transfer_buffer() +{ +#if TRANSACTION_QUEUE_SIZE_SPI + _transaction_buffer.reset(); +#endif +} + +void SPI::abort_all_transfers() +{ + clear_transfer_buffer(); + abort_transfer(); +} + +int SPI::set_dma_usage(DMAUsage usage) +{ + if (spi_active(&_spi)) { + return -1; + } + _usage = usage; + return 0; +} + +int SPI::queue_transfer(void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event) +{ +#if TRANSACTION_QUEUE_SIZE_SPI + transaction_t t; + + t.tx_buffer = tx_buffer; + t.tx_length = tx_length; + t.rx_buffer = rx_buffer; + t.rx_length = rx_length; + t.event = event; + t.callback = callback; + t.width = bit_width; + Transaction<SPI> transaction(this, t); + if (_transaction_buffer.full()) { + return -1; // the buffer is full + } else { + _transaction_buffer.push(transaction); + return 0; + } +#else + return -1; +#endif +} + +void SPI::start_transfer(void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event) +{ + aquire(); + _callback = callback; + _irq.callback(&SPI::irq_handler_asynch); + spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage); +} + +#if TRANSACTION_QUEUE_SIZE_SPI + +void SPI::start_transaction(transaction_t *data) +{ + start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event); +} + +void SPI::dequeue_transaction() +{ + Transaction<SPI> t; + if (_transaction_buffer.pop(t)) { + SPI* obj = t.get_object(); + transaction_t* data = t.get_transaction(); + obj->start_transaction(data); + } +} + +#endif + +void SPI::irq_handler_asynch(void) +{ + int event = spi_irq_handler_asynch(&_spi); + if (_callback && (event & SPI_EVENT_ALL)) { + _callback.call(event & SPI_EVENT_ALL); + } +#if TRANSACTION_QUEUE_SIZE_SPI + if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) { + // SPI peripheral is free (event happend), dequeue transaction + dequeue_transaction(); + } +#endif +} + +#endif + } // namespace mbed #endif